Two chimps tussle for food at Chimp Haven in Keithville, La., Feb. 19. One hundred and eleven chimpanzees will be coming from a south Louisiana laboratory to Chimp Haven, the national sanctuary for chimpanzees retired from federal research.

Stories this photo appears in:

KEITHVILLE, La. (AP) — For the first time in their lives, four aging chimpanzees once used in federal research can go outside whenever they like. They can lie on the grass, clamber onto a platform 20 feet up on a chimp-style jungle gym and gaze freely at the open sky, the vista unbroken by steel bars.